Experimental study on the lateral pressure of self‐compacting concrete on double‐superimposed shear walls

Self‐compacting concrete (SCC) is a type of high‐performance concrete that can self‐fill the internal space of formwork without vibration. It has been widely applied in numerous practical engineering projects, especially in the double‐superimposed composite shear wall structural system, which is a semi‐precast and semi‐cast‐in‐place composite structure consisting of two precast wall panels with a middle cavity that is filled with cast‐in‐place SCC to form an integrated load‐bearing shear wall. To clarify the variation law of lateral pressure exerted by SCC on formwork, eight specimens of lateral pressure tests on wooden formwork were first conducted. The effects of concrete pouring rates, unloading heights and concrete types on the lateral pressure of wooden formwork were analyzed, and a prediction model for the lateral pressure of cast‐in‐place SCC formwork was established. Subsequently, lateral pressure tests during SCC pouring were carried out on full‐scale double‐superimposed composite shear walls. By varying the internal structural configurations of the concealed columns at the joints of precast composite wall panels, the influence of these configurations on the lateral pressure of the concealed column formwork was investigated. The results demonstrate that different structural forms of concealed columns exert a negligible effect on the lateral pressure, and the established lateral pressure prediction model can satisfactorily predict the formwork lateral pressure in practical engineering applications.